Was this ever fixed or not? I got a replacement for my DH67CF because intel put up a bad BIOS update which was unrecoverable. I installed the replacement board, and updated the BIOS to the latest working version. Then I saw the USB 3.0 device cannot start in device manager. I didn't know this problem until now. I had to disable USB Optimization in BIOS to make Renesas USB 3.0 work.